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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventories  
Schedule of inventories

December 31,

December 31,

    

2020

    

2019

(in thousands)

Materials

$

82,679

$

82,155

Work-in-process

 

53,979

 

42,575

Finished goods

 

9,248

 

8,337

Total

$

145,906

$

133,067